MVC 5 Owin Facebook Auth results in Null Reference Exception

Question

I\'m trying to setup integrated OWIN Facebook authentication in a new MVC 5 project in Visual Studio 2013. I have configured apps and keys as per this tutorial:

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Answer 1

I had exactly the same problem by following the same tutorial. I solved it by doing the following two steps: 1> Visual Studio Menu->Tools->Library Package Manager->Manage NuGet Packages for Solution..., then install package: Microsoft.Owin.Host.SystemWeb 2> In the same window, click Update (left bar) and then update all the packages.

Hope this answer will help other people who have the same problem.